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CR 527 begins at a traffic light with New Jersey Route 166 in Toms River.[1] Passing some local roads at the beginning, CR 527 crosses an interchange with the Garden State Parkway at .53 of a mile (0.85 km). More than a mile later, New Jersey Route 37 crosses 527 at a traffic light. Continuing through Toms River Township, CR 571 merges into 527 for about 3/4 of a mile.[1] At 7.57 miles (12.18 km), State Route 70 crosses CR 527. Just past ten miles (16 km), CR 547 crosses in Jackson Township. Further in Jackson Township, CR 527 joins CR 528 for a 3.78-mile-long (6.08 km) concurrency. At the end of the concurrency, CR 527 continues straight while CR 528 leaves to the left and CR 626 (Bennetts Mills Road) leaves to the right.[1]

At 18.05 miles (29.05 km), CR 526 and CR 527 intersect.[1] Less than a mile later, Interstate 195 interchanges with CR 527. Past this interchange, the route passes east of the Jackson Township Park & Ride, a park and ride facility serving Academy Bus Lines. At 19.61 miles (31.56 km), CR 527 leaves Ocean County and enters Monmouth County. On the Freehold / Millstone / Manalapan township border, County Routes 524 and 537 cross. Past 24 miles (39 km) at Carrs Corner, CR 527 turns to the right heading northeast while an alternate route to 527, CR 527A begins straight ahead. At 26.61 miles (42.82 km), New Jersey Route 33 crosses at a traffic light in Manalapan. CR 527 heads north enters Englishtown.[1] In Englishtown, CR 527 reaches the northern terminus of CR 527A at South Main Street and later forms a 0.07-mile-long (110 m) concurrency with CR 522. At 30.58 miles (49.21 km), CR 527 re-enters Manalapan for a short distance. At 31.50 miles (50.69 km), CR 527 enters Monroe Township which is in Middlesex County. 527 spends a short time in Monroe as it soon enters the township of Old Bridge. At 34.29 miles (55.18 km), CR 520 crosses at a traffic light.[1]

View north along CR 527 at Kossman Street in East Brunswick

After passing local roads in Old Bridge, CR 527 merges with Route 18 for about one mile (1.6 km), entering the town of East Brunswick.[1] At 36.68 miles (59.03 km), CR 527 leaves to the right and continues into South River. Just before 41 miles (66 km), CR 535 crosses 527 at a traffic light. Entering East Brunswick again, NJ 18 and CR 527 merge again for about four miles (6 km).[1] In this section, there are exits for Interstate 95 (the New Jersey Turnpike) and U.S. Route 1. CR 527 follows Route 18 into New Brunswick and exits the concurrency with Route 18 and forms one for the entire length of Route 172 through Rutgers University's Douglass Campus. Heading northwest along New Brunswick's George Street, CR 527 then merges into a concurrency with county-maintained sections of Route 171 along George Street and Route 27 on Albany Street (the latter with CR 514). Routes 514 and 527 turn off Route 27 at Easton Avenue. At Somerset Street (47.08 miles (75.77 km)), the concurrency with 514 ends and 527 continues into the outskirts of New Brunswick.[1]

CR 527 northbound past CR 636 in Summit

At 48 miles (77 km), CR 527 enters Franklin Township, Somerset County and approximately a half-mile later, CR 527 splits into a four-lane highway, known locally as Easton Avenue.[1] The stretch does not last long as it ends at about 50.5 miles (81.3 km). At 51.21 miles (82.41 km), the roads split again and soon reach Interstate 287. At 52.13 miles (83.90 km), CR 527 crosses the town border and enters South Bound Brook. Soon entering regular Bound Brook, the road divides again into a divided highway at 53.35 miles (85.86 km). The divided highway merges again at about 53.8 miles (86.6 km). At 54.3 miles (87.4 km), Route 28 crosses.[1] After the intersection with NJ 28, CR 527 enters Bridgewater and crosses with U.S. Route 22. In Watchung, CR 529 leaves to the right. Just past the 61-mile (98 km) mark, the road divides again for a short time. In between this divided stage, CR 531 merges in. 531 leaves as the highways merge again.[1]

The New Brunswick section of CR 527 was known as County Route 3R11 back in 1947. The parts south of that in Middlesex County was known as County Route 3R10.[2] By 1954, the road was known as County Route 527, part of the 500-series county roads adopted by the state of New Jersey.[3]

View north along CR 527A (Iron Ore Road) at Indian Path and Dugans Grove Road in Manalapan

County Route 527A (also known as County Route 527 Alternate or CR 527A) is a county highway in Monmouth County, New Jersey. The highway extends about six miles (9.7 km) from Sweetmans Lane (County Routes 527 and 1) in Carrs Corner, New Jersey, on the border of Millstone and Manalapan townships, following Woodville Road, Iron Ore Road, High Bridge Road, and South Main Street to Park Avenue / South Main Street in Englishtown. It crosses Route 33 about halfway between its two termini.[5] Near its northern terminus, CR 527A formerly followed Iron Ore Road to its end at Millhurst Road (CR 527) in Manalapan, but in late 2015, a jurisdiction swap between Monmouth County and Manalapan / Englishtown routed the county road on a straighter course into the borough.[7]